Harness motion for looms



April 27 5 1926.

J. NORTHROP HARNESS MOTION FOR LOOMS Filed June 5. 1924 3 Sheets-Sheet 1 April 27' 1926. 1,582,421 J. NORTHROP HARNESS MOTION FOR LOOMS Filed June 5, 1924 s Sheets-Sheet 2 6 7 April 21 192s.

J. NORTHROP HARNESS MOTION FOR LOOKS Filed June a 1924 1 s Sheets-Sheet s 55 8 Q 6' 57 L Q 3 z 56 I g 1 /6 Patented Apr, 92 61.

UNITED STATES PATENT OFFICE.

JONAS NORTHRQP, or nornn'ALE, MASSACHUSETTS, ASSIGN'OR 'ro HOPEDALE MANU- rAc'runme comrANY, or MI FORD, MAsSAcHUSETTs, A coRr'on rIoN or uAS'sA- cause-ms.

Application filed June 3, I

To,all whom it may concern: Be it known that I, JoN s Non'rnnor, a citizen of the .United "States, residing at? Hopedale, in the county of Worcester and State of Massachusetts, have invented cer-. tain new and useful Improvements in Harne'ss Motions for Looms; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art-to which it appertains to make and use the same. V

The present invention relates to an improvement in harness motions for looms.

The object of the invention is to reorganize and improve harness motions, and the invention consists in the harness motion hereinafter described and particularly defined in the claims.

- In the accompanying drawings illustrating the preferred form of the-invention, Fig. 1 is a front view of the motion; Fig. 2 is a sectional elevation; Fig. 3 is a plan of one end of the\ areh showing the sup- 5 porting brackets for the motion; Fig. 4

is an end elevation of a harness strap ulley' or sheave; Fig. 5 is a section of the arch showing the mode of supporting the barness operating shaft; ,Fig. 6 is an end elevation of a portion of .the' loom showing the actuating mechanismforthe motion; Fig. 7 is a front elevation of the same; and. Fig. 8 is a sectional elevation on the line e-s Fig. 6.

The illustrated embodiment of the in-. vention is described as follows: The end frames 1 oftheloom support the arch, of which the end posts 2 rise from the frames ,to the cross-channel 3 of the arch and extend fromend post to end post. The harnesses are two in number, the front harness 4"and the rear harness 5. The harness 4 is supported by four straps 6 provided with hooksat their lower ends to engage eyes in the harness frame. These straps 6 extend upward to the sheaves 7 .mounted on the harness shaft 8. The straps 6 are received on a smaller portion 9 of the sheaves 7, being secured thereto by means of the o screw 10. When the shaft'8 turnsto the left, as viewed in Fig. 4., the straps 6 unwind from the sheave and permit the front harness 4 to descend. The rear harness is HARNESS no'rroir non Looms.

1924. Serial m5. 717,539.

similarly supported on thestraps '11 which .of the sheaves, and the rear hafness- 5 is thereby raised. The stroke of the rear harness 1s somewhat longer than the stroke of the front harness .in order to bring the threads carried by the rear harness into the same shed plane as formed by the front harness. The harness shaft 8 ismounted at one end in the bearing 14 in the bracket 15 secured to the cross-member 3 of the arch. Collars 16 and 17hold the shaft 8- from endwise movement. Additional ports 18 for the harness shaft 8 are v ide'd. These supports 18 have shanks -which are received in holes in the crossmember 3 of the arch, being secured in place therein by the set screws 19. Each support 18 is provided with a bearing 20, which is open at the top and supports in the opening the harness shaft. The harness shaft 8 extends across the loom only far enough to carry-thesheaves for supporting the harnesses and terminates, in the illustrated embodiment, before it reaches the end 'of the cross-member 3 of "the arch, as shown at the left hand end of Fig. 1. A

bottom harnessshaft2l is employed which is mounted inbearings 22 which form parts of the brackets 23 which are bolted at 24 to portions 250i theframe of the loom. On the bottom harness shaft 21 are secured two sheaves 26 similar to the sheave 7, on

the top harness shaft 8. These sheaves are.

connected by straps 27 and 28 to the jack sticks 29 and 30, respectively, the jack sticks 30 being hooked on the lower member of the harness frame 4, and the jack sticks 29 being hooked to the lower member of the harness 5 in the usual manner. The. harnesses are. raised and lowered by oscillations' of theupper-harness shaft 8. When the harness 4 is lowered, the harness 5 is raised, and the harnesses are kept under controlbythe bottom harness shaft and the bottom'straps.

The upper harness shaft 8 is provided on ,its right hand end, as viewed in Fig. 1,

vided with a boss 35 at its upper end in which is pivotally received the crank pin 36. This crank pin is received in a radial slot 37 in the segment gear 32, and is adapted to be secured in any position in the slot. With a given stroke of the actuating link 34 the stroke of the segment gear may be varied. This provides for increasing and decreasing the harness movement. The lower end of the actuating link 34 is pro vided with a yoke plate 38. This plate has rearwardly extended flanges 39 which engage the edges of the crank disk 40 mounted on the shaft 41. Inturned lips 42 extend toward the shaft from the flanges 39 and embrace the disk 40 and permit the plate 38 to rise and fall on the disk wheel, holding it from detachment therefrom by lateral movement. The yoke plate 38 is provided with an opening 43 through which the crank pin 44 projects. On the front side of the plate there is attached a cam plate 45 provided at its ends with ears 46. This cam plate 45 is provided with an opening 47, the outline of which is shown in Fig. 6,-the outline being indicated by the reference character 48. The cam roll of the crank pin 44 projects into this opening 47 in the plate 45. The cam plate is secured to the yoke plate by means of the bolts 49, the yoke plate being provided with cars 50 slotted at 51 for the reception ofthe bolts 49. These slots 51 are curved to permit turnin of the cam plate with respect to the yo e plate, so as to vary the timing of the actuation of the link 34 and therefore of the harnesses. The front side of the yoke plate is provided with two ears 52 which receive adjusting bolts 53 by which the position of the cam plate may be adjusted on the yoke plate, after which the cam plate will be secured in adjusted position by means of the bolts'49.

The opening47 in the cam plate is provided with a cover 54 normally held closed by a spring clip 55. The cover will be opened to introduce oil for lubricating the crank pin and cam, and then closed to prevent the access of lint and dust to the cam. The cam plate is curved as. shown in the outline indicated by the reference character 48, that is to say, so that the motion imparted to the yoke by the crank pin has two dwells in it, namely at the top and at the bottom so that during a rotation of the crank disk the cam plate is lifted during the time the crank disk occupies one of the notches in the ends of the cam plate. Then having raised it up to its top position, the cam passes over the arcuate surface of the upper part of the cam, and the cam stands fast during such movement. Thereafter the crank pin enters the other recess and'the plate is depressed. At the end of the depression another dwell occurs. This produces the dwells in the motions of the harnesses to allow time for the shuttle to pass through the sheds.

By varying the position of the cam plate on the yoke plate, and by changing its angle with respect thereto, the timing of the dwells and movements of the yoke plate and therefore of the harnesses may be varied. Thus, viewing the structure as illustrated in Fig. 6, by turning the cam plate to the right or to the left on the yoke plate 38, the time of actuation of the actuating link 34, and therefore the time of actuation of the harnesses, may be made earlier or later. The actuating link is provided with a bolt or slot connection 56 by means of which the length of the link may be varied. With variations in the position of adjustment of the connections 36 to the segment gear, the length of the link may be varied by this bolt and slot connection 56 to adapt it to the position of adjustment preferred. The shaft 41 is supported near its end in the bearing 57 mounted on the portion 58 of the frame of the loom.

It is to be noted that the sheaves or pulleys on the harness shafts may be described as differential harn issconnections, inasmuch as they move the different sheaves different distances so as to secure register of sheds made by the different harnesses.

Having thus described the invention, what is claimed is:

1. A harness 'motion for looms having, in combination, harnesses, an upper harness shaft, a lower harness shaft, connections between the harnesses and harness shafts, a pinion on the upper harness shaft, a segment gear engaging the pinion, a link for actuating the segment gear, a yoke on the lower end of the link provided with a slot having two arcuate dwell surfaces, a crank pin engaging the slot for actuating the link and thereby actuating the harnesses with dwells in their movements.

2. A harness motion for looms having,

in combination, two harnesses, top and bottom harness shafts, connections between the harness shafts and the harnesses, one of said harness shafts being provided with a pinion, a segment gear engaging the pinion, slotted yoke and crank means, and connections between said slotted yoke and crankmeans and the segment gear for actuating the. latter, having provision for turning the yoke for varying the timing of the actuation of the harnesses.

I 3. A harness motion for looms having,in

combination, harnesses, ness shafts, tuatlng the top and bottom har- 5 tively connected with the connecting mechanism provided with a slotted yoke, a crank ,adapted. to engage the s1 ot of the yoke,

means for adjusting the position. of the yoke with respect. to the crank folvaryingthe time of the. harness actuation.

In testimony whereof I have signed my name to this specification.

JONAS. NORTHROP. 

